Page 344 - 5G Basics - Core Network Aspects

1 Core network aspects

For example, in the video conference, the voice is transmitted by 2G, 3G or LTE to assure real-time service,
and the video is transmitted by WLAN, which has higher bandwidth and may be cost efficient for a large
number of network flows; both of these two access networks use the same core network. Data flows can also
be conveyed by different access networks to increase bandwidth.

For example, the user is downloading a multimedia file with a large volume of data. To improve the
downloading rate and to balance the data downloading, the user accesses additional access networks to
increase the bit rate.
4) Scenario D

Scenario D shows a UE connecting to multiple heterogeneous access networks controlled by separate access
control and service control functions. The UE can combine the different network capabilities to serve a
unified application.

For example, the UE has both 2G and WLAN connections; when the video telephone application is launched,
the voice will use the 2G connection to ensure a stable and real-time voice service, and the WLAN connection
will be used to get larger bandwidth for video. However, the UE may connect to a 2G base station and a
WLAN AP simultaneously, and the video telephone application running in the UE may thus have multiple
sessions controlled by different networks.

5) Scenario E
In this scenario, a UE connects to multiple heterogeneous access networks through multiple access points,
which are controlled by separate access control and service control functions for different applications. In
this scenario, a specific application is bound to use a specific network connection. A UE can be treated as a
set of single-interface UEs which support different access technologies and utilize various applications
respectively, but service transfer between different connections should be considered in this scenario.
For example, if the UE connects to the company intranet through a VPN connection over WLAN, and the user
wants to monitor the stock market as well, which is not allowed on the intranet, it is necessary to use the 2G
connection to access the stock application at the same time.

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